What are React Query mutations and how do I use them?

What are React Query mutations and how do I use them?

React Query mutations are used to create, update, or delete data on the server. They help manage server state.

Can you show me an example of a mutation in React Query?

Sure! Here's a simple example:

const mutation = useMutation(newTodo => {
  return fetch('/todos', {
    method: 'POST',
    body: JSON.stringify(newTodo),
  });
});

This code defines a mutation to add a new todo item.

How do I handle errors with mutations?

You can handle errors by using the onError callback in the useMutation hook. For example:

const mutation = useMutation(newTodo, {
  onError: (error) => {
    console.error('Error creating todo:', error);
  },
});